Configuring Additional Features on the Cisco VGD 1T3 Voice Gateway

The information in this chapter applies to the Cisco VGD 1T3 voice gateway. This chapter continues where the "Basic Configuration Using the Command-Line Interface" chapter ends. After you have commissioned your Cisco VGD 1T3 voice gateway, you might want to configure other features that include serial interface support, T1 channel groups, and signaling.

Configuring Synchronous Serial Interfaces for WAN Support

Configure the synchronous serial interfaces on the motherboard to connect to a WAN through a CSU or DSU.

This section describes how to enable the serial interface, specify IP routing, and set up external clock timing on a DCE or DTE interface. To use a port as a DTE interface, you need only connect a DTE adapter cable to the port. When the system detects the DTE mode cable, it automatically uses the external timing signal. To use a port in DCE mode, you must connect a DCE interface cable and set the clock speed with the clock rate configuration command. You must also set the clock rate to perform a loopback test.

Command

Purpose

Step 1

Router> enable

Enters privileged EXEC mode.

Step 2

Router# configure terminal

Enters global configuration mode. You are in global configuration mode when the prompt changes to Router(config)#.

Step 3

Router(config)#interfaceserial 0/0

Enters interface configuration mode and specifies the first interface to be configured.

Step 4

Router(config-int)#ip address
172.22.4.67 255.255.255.0

If IP routing is enabled, assigns an IP address and subnet mask to the interface.

Step 5

Router(config-int)#clock rate 2015232

Configures the external clock signal only if you are configuring a DCE interface. The available options include 1200, 2400, 4800, 9600, 14400, 19200, 28800, 38400, 56000, 64000, 128000, and 2015232.

Step 6

Router(config-int)#no shutdown

Changes the shutdown state to up and enables the interface.

Step 7

Router(config-controller)# Ctrl-Z

Returns to privileged EXEC mode.

Examples

To verify that you have configured the interfaces correctly, use these commands:

•Specify one of the new serial interfaces with the show interfaces serialport command and verify that the first line of the display specifies the interface with the correct slot number. Also verify that the interface and line protocol are in the correct state: up or down.

Router# show interfaces serial 0/0

Serial0/0 is up, line protocol is up

Hardware is 4T

Internet address is 172.0.0.1/8

MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,

reliablility 255/255, txload 1/255, rxload 1/255

Encapsulation HDLC, crc 16, loopback not set, keepalive set (10 sec)

Last input 00:00:08, output 00:00:04, output hang never

Last clearing of "show interface" counters never

Queueing strategy:fifo

Output queue 0/40, 0 drops; input queue 0/75, 0 drops

5 minute input rate 0 bits/sec, 0 packets/sec

5 minute output rate 0 bits/sec, 0 packets/sec

392 packets input, 33312 bytes, 0 no buffer

Received 392 broadcasts, 0 runts, 0 giants, 0 throttles

0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort

358 packets output, 25157 bytes, 0 underruns

0 output errors, 0 collisions, 1 interface resets

0 output buffer failures, 0 output buffers swapped out

0 carrier transitions DCD=up DSR=up DTR=up RTS=up CTS=up

•Display the entire system configuration file with the show configuration command. Verify that the configuration is accurate for the system and each interface.

Tip If you are having trouble, make sure that the network interface is properly connected and terminated.

Configuring ISDN NFAS on Channelized T1 PRI Groups

ISDN Non-Facility Associated Signaling (NFAS) allows a single D channel to control multiple PRI interfaces. A backup D channel can also be configured for use when the primary NFAS D channel fails.

When configuring NFAS for T1 controllers configured for ISDN, you use an extended version of the ISDNpri-group command to specify the following:

•Range of PRI time slots to be under the control of the D channel (time slot 24)

•Function to be performed by time slot 24 (primary D channel, backup, or none); the last specifies its use as a B channel

•Group identifier number for the interface under control of this D channel

Note Your Cisco VGD 1T3 voice gateway must connect to a Primary-4ESS, Primary-DMS 100, or Primary-NI switch and must also have a channelized T1 controller and, as a result, be ISDN PRI capable.

To configure ISDN NFAS, complete the following tasks in controller configuration mode:

Examples

Monitor NFAS groups by entering the show isdn nfas group number command:

Router# show isdn nfas group 0

ISDN NFAS GROUP 0x0 ENTRIES:

The primary D is Serial0:23.

The backup D is Serial1:23.

There are 2 total nfas members.

There are 24 total available B channels.

The primary D-channel is DSL 0 in state IN SERVICE.

The backup D-channel is DSL 1 in state STANDBY.

The current active layer 2 DSL is 0.

Configuring Alarms

Facility alarms currently monitor the following failure events:

•Interface down

•T1 or T3 controller down

•Modem board failure

•Redundant power supply (RPS) failure

•Thermal failure

•Fan failure

Cisco IOS software polls every second to detect the failure events that you have configured and turns on an alarm when any one of the failure events is detected. By default, the facility alarm is off. Users have to configure a facility alarm command to enable monitoring of the failure conditions.

Enter no before the full command to disable any of the alarm commands.

Router(config)# no facility-alarm detect rps

Command

Purpose

Step 1

Router> enable

Enters privileged EXEC mode.

Step 2

Router# configure terminal

Enters global configuration mode. You are in global configuration mode when the prompt changes to Router(config)#.

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